Poncho, have you looked at my plow truck...
No, I'm using the solenoids that are on each starter. If I take a multimeter and measure voltage to the hot (big terminal), I should have right close to the 12.75 volts, right? I don't believe that it would have to run through the plow solenoid in order to run the truck.
1982, it's got the regular GM solenoid on the starter, and then the plow solenoid mounted to the very rusted out inner fender. The cables are all in need of being new, but the truck started before, so I'm stumped as to why it won't start now. It's not like the truck even jiggled over a pothole, it never left my driveway.